Background generation with SGEN

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Hi,

I want to precompile all SAP functions in the background with low priority. However, any time I launch SGEN job (in the background), the system becomes almost unusable. It's very slow to login, etc. even though I'm the only person who uses it at the moment.

Is it possible to set a very low priority for the scheduled job or leaving it for the midnight is the only feasible workaround?